The width of paper is measured in terms of micrometer

If you have trouble with TP falling through your holder, take a core from wrapping paper or plastic wrap and cut it to the length you need for your holder. Then put it inside the roll of toilet paper and use as a roller. Just make sure it’s large enough to go over the prongs on each side of the holder. And don’t forget to keep it when you change rolls. Works like a charm for me. I tried using a paper towel core, but that was the same size as the TP core. You may have to experiment with different types of cores to find the right size.